.relative{
	position: relative;
}
#first-left {
	background: blue;
	position: absolute;
	top: 10px;
	left: 0px;
	bottom: 50px;
	right: 50%;
}

#first-right {
	background: purple;
	position: absolute;
	top: 10px;
	left:50%;
	bottom: 30px;
	right: 0;
}

#fixed {
	position: fixed;
	background: red;
	width: 80px;
	height: 80px;
	margin: 0 auto;
	left: 0;
	top: 0;
	right: 0;
}
